What are some ways to legally watch movies for free online?

Sites such as The Internet Archive, Retrovision and YouTube, stream public domain content including movies for free. Watching movies online for free is illegal unless the copyright of the movie is expired or the movie’s owner has made it available for public viewing without royalties or charges.

Many video streaming sites allow users to watch ad-supported movies for free, so movies are regularly interrupted by commercials that pay for the streaming of the movie. Hulu, Crackle and YouTube are some examples. There are also subscription services that offer unlimited movies for streaming such as Amazon Prime, Netflix and Hulu Plus.